Assighqb to safety cas



w. I. THOMSON.

ELECTRICAL SYSTEM. APPLICATION mm 1:20.14. ms.

1,384,981 Patent! y 19, 1921,

UNITED, stuns e' iilzi rl" 3oFk=1c E; Q

resident of Newark,

- fifems, and with regard the liken One of the objehts t son, a citizen ofthe nited S V and a in the. oounty of x and State of New Jersey, have inyented en Iinprowement m Elude! Systems; of which the following is a. epecificotion. ."lThia inyentlon mletes to electrical systweet-tam more 1515;! features thereof to Bjflflemfifdifitfifi tio'n 'such ae-m used in cu:l1lghtil}g' and b I u provide a practice] 9 hereof the ebove type m which the ties: eflicient notion ia-ettuned under' dlflerentz oonditione of regulition. Another object is to illlmvide a pemtus ofvthe above, whic is simp e t in construction gndin ifiehflie chance of 4 Wm; connection of the v arts in use is lube stmtully eliminated. i Mbjeeta wiit'bem Pm rl i d M hereinafter.

J: invention accordingly conoists in the element; will be egnemplified m otter deecribedond the-noopieof the npglipotion of which will be o1 1e claims Qther'e inshown at 1. be driven fi' irln of oonstruction, combinations of a'nd arrangement of parts which indicated in the wmg I [The accompanying drawing is a diegrem :e'tio plan of one ofwerioue possible em bodimentgzot this invention. i I

'Reierring'now to this dreimting il.dateil,.

1 generator which may 1 field? ofthie generator there isierillly eon neoted a bonipressible pile of carbon disks I pressure on which and consequently reslstehce of which are varied as hereifig'i. ndescribedi L'eedingfrom one termifiijl' of the generator 1 1s a oonductor 4 which is connected withthe coil 5 of an ordinary automatic or main This eoil ter'mrnotes at a contact 6 end with tli slwitc h; member 7 in closed 'tlon. the circuit :s' continued the h conductor 8.v The Witch member: I is normellyspri detract-- ed ondis'attrected bye-voltige coil bridged nemesth 0s: lit coifend coil rater tenuinels and held in fi bg the eonjoint mtion' of 'From the oondhctor 8"curne nt ie led through a storage batte 10 and flin'ent 'coil 11 to the condncton which joins ,thqlnam 13 completing the fiir pmb' to the remaining terto bridged the struotuie heroine cer axle. In theahunt,

extended past the battery-10 e'onrrent in 14 e'li d variable re.

l d through' a handiw'itoh 1% carbon do end reduce in t. h v dugrammntically indicated e'e eghelivni'plkfi levgrfipivohd at? his .as 1 e epring' 19. T 1m at its tree an with n mm'fimhe wh ch ls oontrolled by a voltage v'o'oil" 21 .acmes .the' hon gourmet, as there in: ten y of voltage-1911 @croas the lnmpe 22, e d mcreeaeoffield hock-the hellmnlglevertorelieve sure on the resitqnoe" eiement 'nn Graeme-thee to thumb This action wi increase-the volteale in the resietane element end-bring e volt f age across A is' corrected bye reverse ictio'n- Igml go voltage is maintained eubdontiolly- The negative lamp min 23 1mm;

otal point 24 on which isrmoiiritedim'hwmglmg' contact lever-25. In the position: pg this v r shown in full lines, iii-Indies 3 p.

tact with 5: point 26 onthe conductor which oonnecl with the min he provided for oontagt with the aw-ina'ltifi lever a poir of 'conta'c'ta 28' and 29 of which are engaged by this leve r. i1 i5 swung into the positio'n ind citerl in ME ted linm. The'eontact'ZB. is bonnecte by' conductor 30" with the miuluotor. i'onnngg from the-be and the contact 29 53 con,- nected.b eon octet-31 with idsmhhitp element 2. The cunfent is led flow :the'

gmmmaticall i11 pair of bell renk' 1eve1s35 an letter element -through' a mumullgqk 'ndjustfa conductor tion s such that-the swinging of either'levei;

may vary the pressure on end the ofthe resistance element 3.7 .Both. of theyfl layers are opting-retracted and tend to crease the pressore on the reaistenoe'fglqmeat, and each is provlded at ita mg with a movable core. The core on leveztfiu y k end position of:

n ieins'w -'In this; 7

of the-co a 21 the lampsto-nbrmelitelna l tendency of'the voltage totfallbloil normel" controlled by solenoid 1'1 and that on lorer 36 co-acts with a voltage solenoid 39 connected as shown. V

,(onsidering the action of the solenoid l1 and the parts ansrwiutcdtherewith,and assuming that at a given stage the efi 'eci ot: variations in the old strength of solenoid 39 is negligible it will be seen that any tendency to vsrmtion in thecurrent flowing in the coil ll will remedy itself by a.

' corresponding variation in the resistance of the element 3 and corresponding increase or diminution of thergmemtor field strength. Thus. with the pa set for'a given oyera- 't i0n. the coil 11 will tend to mainnun in itself ll-- substantially constaut ohrrent.

With the parts in the position shoi'in'in full lines in .the' drawings, thecoil 11- is traversed hy the current flowing through the battery, and 'sccordin mined constant, and tie lamp cunent when in dotted lines in the lamps are turned onus'by the switch 14, V *will be added flowing both through-the battery'and the lampsif current -termi.ned fraction-of its-total value passing through-the solenoid. and the remainder the lam are learned on. As this will divide with a certain cw-eclethrough the resistance 32, it will be seen that the total current will be maintained" con- "staht- This follows from the fact that if a 40 'ven' fraction of any quantity is a constant, t e quantity itself is e constant. By suitable adjustment of. the resistance 32, moreoveri the amount of current flow" through coj 11 with the contact member In the position indicated in dotted lines, may be made sub-- sta-ntially equal to'that flowing through this solenoid when the switch member is in the position indicated in full lines. In this parts may act readjustment of the parts is the solenoid with associated through their most efilcient and effective range. This isoi especial value in a parotus such as that herein set 'iiich the generator field resistance is itl'ected by other mechanism such as that controlled by the voltage coil 39 as the manner, no required, and

' relative effect of these two solenoids is substunt total current 0 stantiall unchanged.

It wil thus be seen that by the more throwing of the switch member 25, the entire system may be changed from constant battery cbargingcurrent operation to conation, or 1; reverse. It will'also be seen t at not only t e action but the precise range of action or effect of v he traversed ly this will he main naid condncting'means to the remain assen action of the solenoid 11 may be held sub-j stantiallyoonstant throughout this chair 1e embodiments migt AB various poss b he made of the above invention and as im;

rious changes might be made in the embody, ment above set torth, it is to be understood that all mattcnhersin set forth or shofwh in y he accompanying. drawings is tobe interpreted as illustrative and not in a limiting I claim as my. invention: V 1. In apparatus of the class described,- in mmbinntion. a, generator. -.a storage. battery adapted to lie-charged thereby, regulating.

a ipurntus for saidgenerstor comprising a. coil. lamps'jadnpted to receive current from said generator, means-adapted to alternatively toconnect said coil in a position to by current flowing thnt-tosaid battery arm a position in" ivhielr ltfiw'ill be; traversed "the currentto the'ba'ttery only, and free from thnt to the lamps end means adapted to change the standard of action of said reguluti n nppsi'rstns.

2. n apparatus of the clsjssdeseribqd; in combi'natiqmn generstor' having ashnnt field, winding, a variable resistance operatively related to said field winding, compris ng a current coil adapted u I in reriations in the field strength of sai coil to vary correspondingly the 'va'lue of said resistnnce, a storage connectednyith said enerator-"and parallel one 'with another, an a.- 'nglegdelyito adepted alternatively to arrange ,seidcnrrentooil i'rr'the battery branch or in series between hmps and the generator and said battery and lamps aid bntterynnd it lento-load leading from one terminal of said generator,

a storage battery, a. current. regu paratus connected in a circuit leadin from ting apminal of said generator, lam having one terminal connected to said eon noting moons,

n conductor connected with the remaining 1 currentflcoil, means adapted to srrsnge sald y curcoil either in position to be traversed rent flowing to said lamps and battery or in paratus of the class desoribed,'in V the battery branch. and a circuit positioned.

to receive a substantial proportion of the battery and lamp current with said coil in said first position.

5. In apparatus of the class described, in combination. a generator having a shunt field winding, variable resistance operatirely related to said field winding, means comprising a current coil adapted upon v riations in the field strength of said coil to vary correspondingly the value of said resistance, a storage battery and a lamp load connected with said generator and parallel one with another, a single device adapted alternatively to arrange said current coil in the battery branch or in series between the generator and said battery and lamps, and means rendered operative by said device adapted to shunt a substantial fraction of the current about said coil.

6. In apparatus of the class described, in combination, a generator. conducting means leading from one terminal of said generator, a storage battery, a current regulating coil connected in a circuit leading from said conducting means to the remaining terminal of said generator. lamps having one terminal connected to said conducting means, a. conductor connected with the remaining terminals of said lamps, means comprising a.

switch adapted in one position to connect said conductor with the last terminal of said generator and in another position to connect said conductor between said battery and said current coil. and a shunt circuit about said current coil adapted to be completed as said switch is moved into said second position.

7. In apparatus of the class described, in combination, a generator, conducting means leading from one terminal of said genezator, a storage battery, a current regulating coil connected in a circuit leading from said conducting means to the remaining terminal of said generator, lamps having one terminal connected to said conducting means, a conductor connected with the remainin terminals of said lamps. means comprising a switch adapted in one position to connect said conductor with the last terminal of said generator and in another position to connect said conductor between said battery and said current coil, and a shunt circuit comprising an adjustable resistance element adapted to be mmpleted as said switch is moved in said second position.

In testimony whereof, I have signed my name to this specification this 12th day of December, 191

WILLIAM I. THOMSON. 

